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62-11039
4-15
4.7 OUTPUT OVERRIDES
4.7.1 Speed Control Solenoid (SCS) Overrides
NOTE
When any enabled compartment is calling for
High Speed, the engine will operate in High
Speed, without regard to other compartments.
In order for the engine to operate in Low Speed,
all compartments must be calling for Low
Speed.
With the complex control systems in use with the
Advance Microprocessor, there are many different
reasons the engine may be operating in either High
Speed or in Low Speed besides the number of degrees
the box temperature is away from setpoint . This section
lists the different factors that determine the speed of the
engine, in the order of their priority.
Speed Control Solenoid Overrides in priority order:
1. DEFAULT MODE
Refer to Section 4.4.9
2. HIGH SPEED TO LOW SPEED DELAY
When the unit is operating in High Speed, and the
controller calls for Low Speed,k the engine will remain in
High Speed until the high voltage current draw is less
than 22 Amps, or for 40 seconds if the amperage is
already higher than 22 Amps. It will then to go Low
Speed.
3. SILENT MODE
When the Silent Mode is set for ON in the Functional
Parameter List, the unit will operate in low speed only
4. LOW SPEED ENGINE COOLANT WARM--UP
If engine Coolant Temperature Sensor Alarm is not
active the engine will run in low speed until the coolant is
above 79
_
F (26
°
C).
5. DEFROST
-- Refer to Defrost Control (Section
4.4.10)
6. DOOR/REMOTE SWITCH CONFIGURED FOR
LOW SPEED
The unit will be forced into low speed if the
door/remote switch is open (active) and is configured for
low speed.
7. AUTO START/STOP ECONO MODE
When the unit restarts from an Off Cycle in
Start/Stop due to any reason except for box
temperature away from setpoint, the engine will run in
low speed for the same time as the Minimum Off Time
(unless all conditions are met for another Off Cycle, and
the engine shuts off in less time). If ProductShield
Econo: Go To Continuous becomes active during this
time, the engine will go to normal speed operation until
the next On Cycle. (See Section 4.6 for more
information on ProductShield)
8. HIGH SPEED DELAY
•
The compressor must operate for 2 minutes before
the engine will go to high speed.
•
When the unit is operating in low speed, and the con-
trol calls for high speed, the engine will continue to op-
erate in low speed for the length of time selected in
the Configuration List (0 to 10 minutes). This includes
engine start--up, defrost termination, and normal tem-
perature control.
9. START--STOP WITH A FROZEN SETPOINT
In Start/Stop Mode, when any compartment
setpoint is in the frozen range, and the minimum run
time has expired, and the box temperature is not at
setpoint, the engine will be forced to high speed.
10. FROZEN SETPOINT
If any compartment setpoint is in the frozen range,
and the box temperature in that compartment is below
setpoint, that compartment will call for low speed.
11. LOW SUCTION PRESSURE
If the suction pressure falls to 4 inHg (0.14 Bar) for
more than 20 seconds, and both UL1 and UL2 are
energized, the unit will be forced into low speed for a
minimum of 5 minutes, then remain in low speed until
the suction pressure is greater than 4 inHg (0.14 Bar).
12. START--STOP WITH A PERISHABLE SETPOINT
When only Compartment 1 is enabled, and the
setpoint in Compartment 1 is in the perishable range,
and the unit is operating in Start/Stop and all conditions
for an OFF Cycle are met except for setpoint, the engine
will operate in High Speed to pull down to setpoint and
cycle off quicker.
NOTE
Generally, the unit will go into an Off cycle from
High Speed when this condition occurs. How-
ever, if one of the required conditions for shut
down is no longer met during this time, (for ex-
ample, the battery voltage drops below the con-
figured value, or the charging amps increase
above the configured value, or the engine cool-
ant temperature drops below 122
°
F (50
°
C), the
engine may return to Low Speed operation until
the shut down condition is satisfied, then shut
down from Low Speed.
13. HIGH SPEED PULLDOWN
When only Compartment 1 is enabled, and the
setpoint for Compartment 1 is in the perishable range,
and the unit is operating in Continuous Run, and the
High Speed Pulldown configuration is set for YES, the
engine will operate in High Speed until the box
temperature is within
0.4
°
F (0.2
°
C) of setpoint.
14. PRODUCT SHIELD HIGH AIR
•
When ProductShield High Air is configured on, the
engine will operate in High Speed whenever the ambient
air temperature is outside the Minimum / Maximum
temperature range selected in the configuration list, and
if the Delta--T parameter is not set for OFF in the
configuration list, the Delta--T of the unit must be greater
than the selected value. (See Section 4.6 for more
information on ProductShield.
Summary of Contents for VECTOR 1800 MT
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Page 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
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Page 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
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